Q:
# What is the difference between vertical and horizontal lines?

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### Quick Answer

Horizontal lines are parallel to the horizon or parallel to level ground. They have a slope of zero and are parallel to the x-axis on a graph. Vertical lines are perpendicular to the horizon, parallel to the y-axis on a graph and have undefined slope.

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The term "horizontal" derives from the Latin "horizontem" which means "flat." The term "vertical" derives from the Latin "vertex," which means "highest point."

The slope of a line refers to the change in the rise, or y-value, divided by the run, or the change in x-value. Because a horizontal line does not change in y-value with changes in x-value, its slope may be calculated as zero divided by any number. This results in a slope of zero. For vertical lines, the slope equation leads to a division by zero, which is undefined.

Learn more about Shapes-
Q:
## How many lines of symmetry does a decagon have?

A:A regular decagon has 10 lines of symmetry, one line drawn through each vertex and one line drawn through the midpoint of each edge. A line of symmetry indicates where a polygon can be folded in half to form two equal shapes.

Full Answer >Filed Under: -
Q:
## How many lines of symmetry does a heptagon have?

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Full Answer >**A regular heptagon has seven lines of symmetry.**Each one runs from a vertex to the opposite side, bisecting the side at a 90-degree angle.Filed Under: -
Q:
## How many lines of symmetry does a hexagon have?

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Full Answer >**A regular hexagon with six equal sides has six lines of symmetry.**For all regular polygons, the number of lines of symmetry is equal to the number of sides.Filed Under: -
Q:
## How many lines of symmetry does a pentagon have?

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Full Answer >**A regular pentagon has five lines of symmetry.**An irregular pentagon, with non-equal side lengths and internal angles, may or may not have any lines of symmetry.Filed Under: